(3.) Izračunaj vrednosti izrazov za \( a=-2 \) in \( b=3 \). a) \( 5 a-9 b+4 \) b) \( 7 b+a b-5 a \) c) \( a^{2}+5 b-b^{2} \) (4) Ugotovi pravilnost trditev in napačno

d) \( \left\{\begin{array}{l}x+2=-y \\ -y+3=2 z \\ 4 x-z=1\end{array}\right. \)

Use the power of a power property to simplify: \( (2y^{5})^{2} \)

(4) \( (x+3)^{3}=343 \)

в) \( \left\{\begin{array}{l}4 x-7 y=30 \\ 4 x-5 y=90\end{array}\right. \)

47. ( \( 99-4-32) y=\pi s i n \pi x+2 x-4 \) funksiyaning \( x= \) 1 bo'ganda qiymati 3 ga teng bo'ladigan bosh lang ich funksiyasi \( x \) ming qanday qiymatida nolg aylanadi? \( \begin{array}{lllll}\text { A) } 0 & \text { B) } 1 & \text { C) } 0,5 & \text { D) } 2 & \text { E) }-2\end{array} \)